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/*
 * Copyright 2014-2018 Groupon, Inc
 * Copyright 2014-2018 The Billing Project, LLC
 *
 * The Billing Project licenses this file to you under the Apache License, version 2.0
 * (the "License"); you may not use this file except in compliance with the
 * License.  You may obtain a copy of the License at:
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */

package org.killbill.billing.util.glue;

import java.util.Map;

import javax.cache.Cache;
import javax.cache.CacheManager;
import javax.cache.configuration.Configuration;

import org.killbill.commons.utils.Preconditions;
import org.killbill.billing.util.metrics.JCacheGaugeFactory;

import org.killbill.commons.metrics.api.Gauge;
import org.killbill.commons.metrics.api.MetricRegistry;

abstract class CacheProviderBase {

    private final MetricRegistry metricRegistry;

    CacheProviderBase(final MetricRegistry metricRegistry) {
        this.metricRegistry = metricRegistry;
    }

     void createCache(final CacheManager cacheManager, final String cacheName, final C configuration) {
        // Make sure we start from a clean state - this is mainly useful for tests
        cacheManager.destroyCache(cacheName);

        final Cache cache = cacheManager.createCache(cacheName, configuration);
        Preconditions.checkState(!cache.isClosed(), "Cache '%s' should not be closed", cacheName);

        // Create the metrics for this cache
        final Map> metrics = JCacheGaugeFactory.forCache(cacheName);
        metrics.keySet().forEach(metricName -> metricRegistry.gauge(metricName, metrics.get(metricName)));
    }
}